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                    AJ Utils
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            <article class="aj-text">
                <h1>ZipHelper Tutorial</h1>
<p>This tutorial provides an overview of the <code>ZipHelper</code> class, which is part of the <code>lightweight-component/aj-util</code> library. The <code>ZipHelper</code> class provides utility methods for ZIP compression and decompression operations.</p>
<h2>Introduction</h2>
<p>The <code>ZipHelper</code> class contains static methods for working with ZIP files, including compression, decompression, and file type detection.</p>
<h2>Main Features</h2>
<ul>
<li>ZIP file decompression with directory handling</li>
<li>File and directory compression (with STORED or DEFLATED options)</li>
<li>Recursive directory compression</li>
<li>ZIP file detection (magic number check)</li>
<li>CRC32 checksum calculation</li>
<li>Automatic directory creation</li>
</ul>
<h2>Methods</h2>
<h3>1. Decompression</h3>
<ol>
<li><code>unzip(String save, String zipFile)</code> - Decompress ZIP file to target directory</li>
</ol>
<h3>2. Compression</h3>
<ol>
<li><code>zipFile(File[] fileContent, String saveZip, boolean useStore)</code> - Compress files to ZIP</li>
<li><code>zipDirectory(String sourceDir, String saveZip, boolean useStore)</code> - Compress directory to ZIP</li>
</ol>
<h3>3. Utility Methods</h3>
<ol>
<li><code>initFolder(File file)</code> - Ensure parent directories exist for a file</li>
<li><code>initFolder(String file)</code> - String version of initFolder</li>
<li><code>isZipFile(String filePath)</code> - Check if file is a valid ZIP file</li>
<li><code>getFileCRCCode(File file)</code> - Calculate CRC32 checksum for a file</li>
</ol>
<h2>Usage Examples</h2>
<h3>Decompression</h3>
<pre><code class="language-java">ZipHelper.unzip(&quot;C:/extracted&quot;, &quot;C:/archive.zip&quot;);
</code></pre>
<h3>File Compression</h3>
<pre><code class="language-java">File[] files = {new File(&quot;file1.txt&quot;), new File(&quot;file2.txt&quot;)};
ZipHelper.zipFile(files, &quot;archive.zip&quot;, false); // Use DEFLATED compression
</code></pre>
<h3>Directory Compression</h3>
<pre><code class="language-java">ZipHelper.zipDirectory(&quot;C:/data&quot;, &quot;backup.zip&quot;, true); // Use STORED (no compression)
</code></pre>
<h3>ZIP File Detection</h3>
<pre><code class="language-java">boolean isZip = ZipHelper.isZipFile(&quot;unknown.zip&quot;);
</code></pre>
<h3>Directory Creation</h3>
<pre><code class="language-java">ZipHelper.initFolder(&quot;C:/new/path/file.txt&quot;); // Creates C:/new/path if needed
</code></pre>
<h2>Compression Methods</h2>
<p>The class supports two compression methods:</p>
<ol>
<li><code>DEFLATED</code> (default) - Standard ZIP compression</li>
<li><code>STORED</code> - No compression, files are stored as-is</li>
</ol>
<h2>Error Handling</h2>
<p>The methods handle common IO errors and log warnings when issues occur during compression/decompression.</p>
<h2>Conclusion</h2>
<p>The <code>ZipHelper</code> class provides comprehensive utility methods for working with ZIP files, making compression and decompression operations more convenient in Java applications.</p>

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